http://i60.tinypic.com/6z93cn.png
vs independent testing with a GP4000s on a bike
vs Hed’s published data
vs data on a Scott frame
.
Exact same response I had earlier when I saw this.
It was a hmmmmmmmmmmmmmm…something is not right here
Wow, I’m shocked. Hed’s chart shows Hed wheels fastest!
Between 0 and 12.5 degrees they’re so similar it’s not worth sweating over. What I take away from this chart is how big of an impact tires have on aerodynamics.
Looks like HED is about 5 grams of drag slower than Zipp and ENVE on the independent testing chart
.
Old Zipp or new Zipp tires?
Old Zipp or new Zipp tires?
Old ones most likely, the new ones are supposed to be at least as fast as the GP4000s.
Wait, hed’s data is jet 6 plus against 404. Independent data is jet 6/9 plus against 808 in a bike with different tires and you are surprise they are different?
The independent test is with wheels in a bike, and compares a 6/9 to a zipp 808 front and rear.
The HED data is just a Jet 6 s a 404 in isolation
The independent test is with wheels in a bike, and compares a 6/9 to a zipp 808 front and rear.
The HED data is just a Jet 6 s a 404 in isolation
Yes. I’d also consider that the differences between the Jet 6 and 9 are very small at lower yaw angles.
I’m also pointing out that I wish Cervelo published the data since they are using this data to support their partnership with Hed.
I think you are underestimating the impact of testing in a bike and the differences in wheels(404 v 808) and tires.
Old Zipp or new Zipp tires?
Old ones most likely, the new ones are supposed to be at least as fast as the GP4000s.
The new zipps rolling resistance is better than the GP4000s, but I do not see anywhere that they are more aerodynamic.
I think you are underestimating the impact of testing in a bike
That might very well be the case.
The new zipps rolling resistance is better than the GP4000s, but I do not see anywhere that they are more aerodynamic.
They don’t state it (which is surprising considering they’ve put a lot of work into the aerodynamic performance of their tires) but they spent a ton of time at A2 earlier this year testing different tire shapes, sizes, and tread patterns. I would imagine they are optimized for the firestrike/firecrest profile.
Seeing how well the Attack/GP4000S performs, I’m not sure I’d take the minor aero gain for the reduced puncture protection.
And as an aside, the Attack is an absolute bitch to get on the Jet+ rim.
it’s interesting that the Jet 22 vs. Jet+ 22 drag profile is very similar to the Attack vs. 4000s drag profile. breaks away at 12.5 degrees of yaw, 50 grams of difference, etc.
vs independent testing with a GP4000s on a bike
vs Hed’s published data
vs data on a Scott frame
what I take away is that wider is just as fast as narrow if using an aerodynamic shape or airfoil.
Between 0 and 12.5 degrees they’re so similar it’s not worth sweating over. What I take away from this chart is how big of an impact tires have on aerodynamics.